dimond



(No Model.) 2 sheets-sheen 1. y

Gr. H. DIMOND.

SEWING MACHINE.

No. 317,749. Patented May 12, 1885.

Y am

.m11 ,II L gel (No Model.) 2 Sheets-Sheet 2.

G. I-I. DIMOND.

SEWING MACHINE.

No. 317,749. Patented May 12, 1885.

Irv/E51 fm1- WiqEEEEE.

N. Punks, Phmulhugmphor. wanmngm. n. C.

IINrrnn .STATES PATENT Ottica@ GEORGE II. DIMOND, OF BRIDGEPORT,CONNECTICUT, ASSIGNOR TO TI-IE WHEELER St VILSON MANUFACTURING COMPANY,OF SAME PLACE.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 317,749, dated May l2,1885.

Application filed December 14, 1883. (No model.)

Bridgeport, county of Fairiield, State of Con-A necticut, have inventedan Improvement in Sewing-Machines, of which the following description,in connection with the accompanying drawings, is a specication, likeletters on the drawings representing like parts.

This invention has especial reference toa novel thread-clamp or grippingdevice, itbeing independent of the usual tension device, which latter isconstant in its operation, the said clamp operating in connection with a'take-up to clamp and hold the needle-thread positively fromsubstantially the time that the take-up lever commences to draw up theloop of needle-thread cast off by the hook, the said clamp holding thesaid thread until the loop of the stitch just being made is drawn intothe goods and finished, the clamp, however, being released from theneedle-thread just before the take-up `lever completes its upwardmovement, thus enabling the take-up lever, at the termination of itsupward movement, to draw thread from the tension device for the nextstitch.

Figure 1 represents in side elevation a Wheeler St Wilson No. 10sewing-machine, which I have selected upon which `to illustrate myinvention, parts thereof being broken away. Fig. 2 is a partial view ofthe opposite side of the said machine. Fig. 3 is a partial front`elevation thereof; and Fig. 4 a detail of the slide-spindle which holdsthe fulcrum-pin of the lever of the thread-clamp.

The bed-plate A, overhanging arm A', main rotating shaftA2, rotatinghook A3, needlebar rock-shaft B, needle-bar B', presser-footliftinglever B2, and the means for connecting and operating t-he said parts areall as common in the Wheeler & Nilsen sewing-machine style No. 10.

The takenp lever D, arranged at the front of the machine and connectedwith a rockshaft, D', substantially parallel with the roekshaft B, isadjustably attached to a connecting-rod, D?, having a roller-stud, whichis made to enter a groove in a cam-hub, E, attached to the main shaftA2, the said cam os- 53 cillating the shaft D at suitable times to causethe take-up lever D to take up the needlethread properly in theformation of a stitch, substantially as in application No. 101,735,filed July 24, 1883.

I prefer to use a take-up substantially such 5; as described in the saidapplication, as the same is capable of adjustment when necessary,irrespective of the needleoperating mechanism; but I do not herein layclaim to such take-up mechanism by itself.

The needle-thread a, taken from the spool a', is passed forward aboutthe usual threadcheck, a2, and then around a tension-pulley, ai, bothcommon to the said Wheeler St Vilson machine, but herein thesaidthread-check and pulley are placed on the overhanging arm A near thepath of movement of the needle-bar B', instead of upon the said arm nearthe middle of its length, as heretofore, such change ofposition enablingme to do away with the long bight of thread between the saidtensionpulley and the needle b. From this tension-pulley as (alwayssubjected to friction, but which may be more or less, according to thepressure put upon the spring b2 by the nut b3) the 75 needle-thread isled to the clamp or gripping device c, thence to and through the eye 2of the take-up lever D, and to and through the eye of the needle b.

The thread clamp or gripping device c, as 8o herein shown, is composedof a disk', 12, and a rest, 18, back of it, the disk being placed on apin, 14, attached to the arm A, and placed between the said arm and thelever d, the latter having its fulcrum at d, and provided at its lowerend with a hole to pass over the pin 14, so that the said lever may actupon the disk 12 of the clamp or gripping device, and cause the threadbetween the disk 12 and the rest 13 to be held. The upper end of the le-9o ver d is preferably provided with an adjustable shoe, d, and operatedupon bya roller, e,- or it might be a projection, deriving its motionfrom an arm, 3,01 the needle-bar-actuating rock-shaft B.

The fulcrum d' of the lever d is arranged in ears of ahorizontally-sliding spindle, d3, provided with a screw-thread andextended through a spiral spring, d4, in a chamber of an ear orprojection of the frame-Work, the Ioo said spindle next the said springbeing provided with an adjusting-nut, e.

The end 4 of the spindle cl3 is beveled, (see Fig. 4,) to be acted uponby an inclined surface made in an arm, f, having its fulcrum at f', andadapted to be acted upon by the usual presser-foot-lifting lever B2,when the said lever has been moved into the dotted-line position, Fig.2, to fully lift the presser-bar P, (partially shown in only Fig. 3 ofthe drawings,) for removal of the work or other purpose. will be justthe same as in the usual Wheeler 85 Vilson machine.

When the lever B2 is lifted, as shown in dotted lines, Fig. 2, it willraise the arm f, and the latter will act upon the spindle d3 and forceit toward the operator or to the right, viewing Fig. 3, and the fulcrumd of the lever d will be moved in that direction far enough to unclampthe thread. It will be noticed that the arm f is provided with a notchor recess at its inner side to receive the end of the spindie d3 (seeFigs. 3 and 4) when the presser-bar is down, the said notch or recessbeing of sufcient depth to receive the end of the spindle d3 and permitthe spring d thereon to assume control of the lever d.

If the lever d were rigid and its fulcrum were upon a pin fixed in anon-yielding part of the machine rather than on the sliding spindle cl3,the action of the roll e upon the shoe d2 at the upper end of the saidlever would force the lower end thereof in an unyielding manner againstthe clamping disks or plates, which would be objectionable, as suchpressure would be apt to crush the needle-thread between the said disksor plates.

A light spring, g, has been interposed be-V tween the lever d and theframe of the machine, as shown in Fig. 3, the normal tendency of thesaid spring being to keep the lower end of the lever close to, but so asnot to press against,the disks or plates so long as the upper end of thesaid lever is not acted upon by the roll e.

When the machine is started,the projection 7 (see dotted lines, Fig. 3.)on the hub of the arm 3 ofthe rock-shaft B will strike the upper end ofand drive the arm f down into the position indicated in Figs. 3 and 4,and so that it will release the spring-held spindle da and throw theclamping or gripping devices into action.

In this present invention the take-up lever D, constructed as shown, theclamp or grip- The presser-bar (but partially shown) ping device, andthe tension-wheel a3 are all arranged quite near the path of movement ofthe needle-bar, thus enabling the quantity of needle-thread between thetension-wheel and eye of the needle to be materially shortened, andenabling those evils which low from elasticity of the needle-threadcommonly experienced when the thread between the tensionwheel and eye ofthe needle is unnecessarily long to be entirely overcome.

I am aware that a rotating tension-wheel has been acted upon bya brakeand prevented from rotation, thus limiting the amount of thread whichmay be drawn oft' by a take-up lever.

I claim- 1. In a sewing-machine, the tension device.

a3 and take-up D, combined with a threadgripping device, c, arrangedbetween the tension-device and take-up, the lever d, carrying saidgripping device and having a sliding fulcrum, the needle-bar-actuatingrock-shaft and connections between said levers, fulcrum and rock-shaftto operate said thread-gripping device, substantially as and lfor thepurpose specified.

2. The needle-baractuating rock-shaft, the thread-clamp, and the leverd, having its fulcrum on a sliding spring-held spindle,d3,combined witha roll or projection deriving its movement from the said rock-shaft,longitudinal movement of the said spindle obviating crushing the threadwhen acted upon by the clamping-disk, substantially as described.

3. The needlebar-actuating rock shaft, thread-clamping disk or plate,and the lever d, having its fulcrum on a sliding spring-held spindle,combined with a roll or projection deriving its movement from the saidrock-shaft, and with an arm to act upon the spring-held spindle to moveit in the direction to remove the pressure of the clamping or grippingmechanism from the needle-thread, substantially as described.

4. The spring held spindle, the lever d, mounted thereon, the threadclamping and gripping device, the arm f, having the notch or recess, andthe needle-bar-actuating rockshaft, combined with the projection 7, mademovable therewith to actuate the said arm and permit the spring on thesaid spindle to assume control of the said lever, substantially asdescribed.

In testimony whereofI have signed my name to this specication in thepresence of two subscribing witnesses.

GEORGE H. DIMOND.

Witnesses:

F. HURD, A. R. LAcnY.

IOO

IIO

